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QUESTION
Q506) In the complete absence of which the duodenal digestion of chyme proteins not possible ....[ Guj CET 2010 ]

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Gastrin is a peptide hormone that stimulates secretion of gastric acid (HCl) by the parietal cells of the stomach and aids in gastric motility. In the absence of HCl (Hydrochloric acid) pepsinogen is not activated and converted into pepsin. (ii) Hence no protein digestion takes place.
Answer : (c)